Micrometer attachment.



W. H. F. KAMOWSKE.

MICROMETER ATTACHMENT.

APPLICATION FILED MAR. 10, l9l5.

Patented Mar. 21, 1916.

3mm VV. HF Kamowske warms, n. c

TINITED STATES PATENT GFFC.

WALTER H. F. KAMOWSKE, OF CHICAGO, ILLINOIS.

MICROMETER ATTACHMENT.

Application filed March 10, 1915.

To all whomit may concern:

Be it known that I, IVALTER H. F. KAMowsKn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Micrometer Attachments; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to an attachment for micrometers.

The object of the present invention is to provide a simple, practical, and inexpensive device adapted to be readily applied to micrometers and capable of enabling the position of a hole in a piece of material with respect to the center and sides thereof to be easily and quickly ascertained in readings of the micrometer so that the difference between a bore or opening and the sides of the material may be ascertained to the thousandth of an inch.

A further object of the invention is to provide a device of this character adapted to enable pins of a plurality of sizes to be readily connected to it to fit the hole bored or drilled into the material to be measured so that the same device may be used on different kinds of material having different sizes of bores.

With these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing Figure 1 is a plan View of a micrometer provided with an attachment constructed in accordance with this invention, the micrometer screw being arranged in contact with one of the side faces of a piece of work, Fig. 2 is an edge view, the micrometer screw being arranged in contact with the opposite side face of the work. Fig. 3 is a sectional view taken longitudinallv of the attachment. Fig. 4 is a detail sectional view showinr another form of Like numerals of reference designate cor- Specification of Letters Patent.

Patented Mar. 21, 1916.

Serial No. 13,514.

responding parts in the several figures of the drawing.

In the accompanying drawing in which is illustrated the preferred embodiment of the invention, 1 designates a micrometer frame of approximately U-shape composed of spaced legs and a connecting portion and equipped at one of its legs with a micrometer screw 2, a vernier 3, and a ratchet operating device 4. The micrometer which is provided with the usual lock nut 5 is of the ordinary construction and the micrometer screw is operated in the usual well known manner.

Coming now to the present invention, 6 designates av supporting member constructed of suitable metal and provided with a slot 7 in which is arranged the connecting portion 8 of the frame of the micrometer. The supporting member 6 which is arranged at right angles to the micrometer screw 2, is secured in its proper position on the frame 1 by means of end and side screws 9 and 10 mounted in threaded openings 11 and 12 of the supporting member 6. The supporting member 6 which projects inwardly from the inner side edge of the transverse portion 8 of the frame 1 is provided in its inner projecting portion with a threaded socket 13 for the reception of a threaded end 14 of a pin 15 adapted to extend into an opening or bore 16 drilled into a piece of material 17. The pin 15 is provided at its threaded end 14: with a collar or enlargement 18 forming a shoulder for engaging the inner end of the supporting member 6 and adapted to be screwed tightly against the same whereby the pin 15 is rigidly supported by the member 6. The pin 15 is of a relatively large diameter and when it is desired to employ a smaller pin to fit in a smaller bore or opening of a piece of material, the outer portion of the pin is reduced to the required diameter as illustrated at 19 in Fig. 4 of the drawing. The pin 20 having the reduced outer portion 19 is otherwise constructed similar to the pin 15 and is uniform therewith so that any one of a plurality of pins may be readily applied to the supporting member 6 to adapt the device to the work to be measured so that onlv one attachment need be provided for a micrometer.

The pin carried by the supporting member 6 is of a length to extend outwardly l)- yond the micrometer screw 2 and when it is desired to ascertain whether a hole drilled in a piece of material is at the center or how far off center it is, the material is placed on the pin and the micrometer screw is screwed inwardly against one side of the piece of material and the micrometer reading is read in the usual manner. The material is then reversed to present its opposite side face to the micrometer screw which is run up against the material. The micrometer reading is then compared with the former reading and the exact difference between the opening and the opposite side faces of the material may be ascertained to the smallest fraction of an inch of the graduations of the micrometer. This will obviate the more or less crude and inaccurate methods at present employed for this purpose.

The end screw is provided with a smooth inner terminal portion 21 which fits in a smooth socket in the outer edge of the frame 1. While the screws 9 and 10 rigidly se cure the supporting member to the frame any other suitable means may of course be employed for this purpose.

\Vhat is claimed is 1. The combination with a micrometer including an approximately U-shaped micrometer frame open at one side of the instrument, and a micrometer screw mounted on one side of the said frame, of an attachment mounted on the micrometer frame between the sides thereof and provided with a pin extending outwardly from the frame through the open side thereof to a point beyond the frame and constituting a pivot to permit work on the pin to be moved beyond the frame and reversed without taking it off the pivot.

2. A micrometer attachment including a supporting member provided with means for mounting it on a micrometer and having a socket and a pin provided with means for engaging the socket of the supporting member and removably mounted thereon to enable a pin of a different diameter to be em ployed, said pin being arranged at an angle to the micrometer screw and adapted to extend into an opening of a piece of metal,

which is reversible on the pin to present both of the side faces thereof to the micrometer screw.

In testimony whereof I affix my signature in presence of two witnesses.

WVALTER H. F. KAMOVSKE. Witnesses H. J. ZIEMANN, J OHN STONE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

